Field Detection and Assessment of Anchoring Force in Prestressed Ring Anchors of the Xiaolangdi Sediment Discharge Tunnel After 27 Years of Service

LIU Huan-hu; XIE Bao-feng; SHI Ming; HUANG Zhuo; SUN Xing-song

doi:10.11988/ckyyb.20260341

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Journal of Changjiang River Scientific Research Institute ›› 0 DOI: 10.11988/ckyyb.20260341

Field Detection and Assessment of Anchoring Force in Prestressed Ring Anchors of the Xiaolangdi Sediment Discharge Tunnel After 27 Years of Service

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Abstract

The long-term prestress retention capacity of prestressed ring anchors in hydraulic tunnels is a key indicator determining structural safety and service life. To detect the anchorage force of ring anchors in the prestressed lining of No. 1 sediment discharge tunnel at Xiaolangdi after 27 years of service, two prestressed ring anchors from Test Blocks 9 and 10 were selected for in-situ lift-off testing. To address the limited installation space for ring anchors in prestressed linings, the high sealing requirements of anchor slot, and the poor adaptability of conventional anchor-cable testing methods, a lift-off testing system suitable for ring-anchor anchorage-force measurement in prestressed hydraulic tunnel linings was developed, and the corresponding testing procedure was established. The testing system uses a deviator to change the loading path, enabling lift-off loading within the limited space of the anchor groove while also protecting the original anchor groove and sealing structure, thus offering strong field adaptability. Field tests on two ring anchors were successfully completed. The results showed that the proposed system satisfied the requirements for field installation, loading, and anchorage-force measurement. The measured anchorage force after 27 years ranged from 91.27% to 117.03% of the locked force, with an average of 104.72%, indicating no obvious reduction and an overall level close to the design value. The study demonstrated that the lift-off method was applicable to anchorage-force assessment of prestressed lining ring anchors, and that the long-term service performance of the lining remains stable.

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prestressed concrete lining / anchor cable / anchoring force / detection / assessment

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LIU Huan-hu , XIE Bao-feng , SHI Ming , et al . Field Detection and Assessment of Anchoring Force in Prestressed Ring Anchors of the Xiaolangdi Sediment Discharge Tunnel After 27 Years of Service[J]. Journal of Changjiang River Scientific Research Institute. 0 https://doi.org/10.11988/ckyyb.20260341

References

List( Publishing order | Descend order by publishing year | Descend order by cited within ) Chart analysis

[1]	张有天. 水工隧洞建设的经验和教训(上)[J]. 贵州水力发电, 2001, (4): 76-84. (ZHANG Youtian. Experience and lessons from construction of hydraulic tunnels, Part I[J]. Guizhou Water Power, 2001(4): 76-84. (in Chinese))

[2]	张有天. 我国水工地下结构建设的理论与实践[J]. 水力发电, 1999, (10): 48-52. (ZHANG Youtian. Theory and practice of hydraulic underground structure construction in China[J]. Water Power, 1999(10): 48-52. (in Chinese))

[3]	SL 279-2016,水工隧洞设计规范[S]. 北京: 中国水利水电出版社, 2016. ( SL 279-2016,Design code for hydraulic tunnel[S]. Beijing: China Water Power Press, 2016. (in Chinese))

[4]	薛兴祖. 隧洞无粘结环锚预应力混凝土衬砌技术研究进展[J]. 山西建筑, 2017, 43 (36): 161-162. (XUE Xingzu. Research progress of unbonded ring-anchored prestressed concrete lining technology for tunnels[J]. Shanxi Architecture, 2017, 43(36): 161-162. (in Chinese))

[5]

电力部东北勘测设计院预应力灌浆验试组. 白山水电站压力隧洞灌浆式预应力衬砌的试验研究[J]. 水力发电, 1981, (1): 10-18.

( Prestressed Grouting Test Group of Northeast Investigation and Design Institute, Ministry of Electric Power. Experimental study on grouted prestressed lining of pressure tunnel in Baishan Hydropower Station[J]. Water Power, 1981(1): 10-18. (in Chinese))

[6]	符志远, 谢红兵, 张邦圻, 等. 清江隔河岩电站压力隧洞环锚预应力衬砌设计[J]. 人民长江, 1997, (7): 20-22,25,49. (FU Zhiyuan, XIE Hongbing, ZHANG Bangqi, et al. Design of ring-anchored prestressed lining for pressure tunnel of Qingjiang Geheyan Hydropower Station[J]. Yangtze River, 1997(7): 20-22, 25, 49. (in Chinese))

[7]	刘兴宁, 张宗亮. 天生桥一级水电站引水系统环锚试验[J]. 水力发电, 1999, (3): 28-31. (LIU Xingning, ZHANG Zongliang. Ring-anchor test of water conveyance system in Tianshengqiao First Stage Hydropower Station[J]. Water Power, 1999(3): 28-31. (in Chinese))

[8]	林秀山, 沈凤生. 小浪底工程后张法无粘结预应力隧洞衬砌技术研究与实践[M]. 黄河水利出版社, 1999. (LIN Xiushan, SHEN Fengsheng. Research and practice of post-tensioned unbonded prestressed tunnel lining technology in Xiaolangdi Project[M]. Zhengzhou: Yellow River Conservancy Press, 1999. (in Chinese))

[9]	林秀山, 沈凤生. 排沙洞无粘结预应力混凝土衬砌的研究与实践[J]. 水力发电, 2000, (8): 46-49,73. (LIN Xiushan, SHEN Fengsheng. Research and practice of unbonded prestressed concrete lining for sediment sluicing tunnel[J]. Water Power, 2000(8): 46-49, 73. (in Chinese))

[10]	李英勇, 王梦恕, 张顶立, 等. 锚索预应力变化影响因素及模型研究[J]. 岩石力学与工程学报, 2008, (S1): 3140-3146. (LI Yingyong, WANG Mengshu, ZHANG Dingli, et al. Study on influencing factors and model of prestress variation in anchor cables[J]. Chinese Journal of Rock Mechanics and Engineering, 2008(S1): 3140-3146. (in Chinese))

[11]	曾宪明, 陈肇元, 王靖涛, 等. 锚固类结构安全性与耐久性问题探讨[J]. 岩石力学与工程学报, 2004, (13): 2235-2242. (ZENG Xianming, CHEN Zhaoyuan, WANG Jingtao, et al. Discussion on safety and durability of anchorage structures[J]. Chinese Journal of Rock Mechanics and Engineering, 2004(13): 2235-2242. (in Chinese))

[12]	GB/T 14370-2015, 预应力筋用锚具、夹具和连接器[S]. 北京: 中国标准出版社, 2015. ( GB/T 14370-2015, Anchorage, grip and coupler for prestressing tendons[S]. Beijing: Standards Press of China, 2015. (in Chinese))

[13]	GB/T 5224-2014, 预应力混凝土用钢绞线[S]. 北京: 中国标准出版社, 2014. ( GB/T 5224-2014,Steel strand for prestressed concrete[S]. Beijing: Standards Press of China, 2014. (in Chinese))

[14]	屈章彬. 小浪底工程排沙洞预应力观测资料整编分析与研究[M]. 黄河水利出版社, 2009. (QU Zhangbin. Compilation, analysis and study of prestress monitoring data of sediment sluicing tunnel in Xiaolangdi Project[M]. Zhengzhou: Yellow River Conservancy Press, 2009. (in Chinese))